82 • Motor and Soft Starter Protection
_____________________________________________________________________________________________
8.4
Auto Reset
UNDER VOLTAGE and PHASE LOSS faults can auto-reset (refer to section
7.8.6 on page 71). The HRVS-
DN will reset itself 60 seconds after voltage was fully restored, provided that the START signal is removed.
UNDER CURRENT fault can be set to auto-reset (refer to section
7.8.6 on page 71).
The HRVS-DN will reset itself when a programmed time delay has elapsed even if the START signal is not
removed!
MOTOR INSULATION ALARM auto-resets if the resistance exceeds the INSULATION ALARM level (refer to
section
7.8.6 on page 71).
WARNING!
Auto Reset explained here above corresponds to the HRVS-DN IP00 unit
(OEM Kit). When the HRVS-DN is installed in a cabinet the behavior of the
Auto Reset depends on the cabinet wiring as well.
It is customer responsibility to avoid any dangerous conditions when the
HRVS-DN IP00 is installed in a medium voltage cabinet.
8.5
Timing Occurrence Table
Timing And Occurrence
Active During
Start Run Stop
Soft
Stop
Too many starts
with START INHIBIT period
√
Coast Down Time
with start (after stop) inhibit time
setting.
√
Electronic overload
with curve selection
√
(1)
√
(1)
O/C shear pin (jam)
HRVS-DN protection
– trip immediately at I
≥
850% FLC in less
than 1 cycle.
√
√
√
Motor protection
– trip function
During start
– factory set at 850% FLA after O/C DELAY.
√
√
During run –
adjustable 100 – 850% FLA after O/C DELAY.
√
Under current
adjustable time delay
√
Unbalance current
adjustable time delay
√
√
√
Ground fault current
adjustable time delay
√
Phase loss
√
√
√
Phase sequence
√
Under voltage
with adjustable time delay. Time delay is
override in case of PHASE LOSS.
√
√
√
Over voltage
with adjustable time delay
√
√
√
Long start time
(stall protection)
√
Shorted SCR or Wrong Connection
√
√
External fault 1 & 2–
input from a N.O. contact
√
√
√
√
SCR protection
by Metal Oxide Varistors (MOV)
√
√
√
√
HRVS-DN Power Section over-temperature
√
√
HRVS-DN internal test,
when the
On
LED is lit.
√
√
√
√
Motor insulation test
(optional) – Two levels for alarm &
trip. When installed, operates when mains voltage is
removed.
√
